this morning. Now, to that dramatic day at the beach for one father and his son. They were struck by lightning when they were kite surfing florida. Beachgoers ran for help. And we're hearing the 911 calls for help for the first time. Matt gutman has the story. Reporter: For a terrifying moment, 14-year-old kyle weltson thought he lost his father. There was a big, white flash. I dropped my kite. I looked over and saw him on the ground. Reporter: Bystanders began sprinting. His eyes were open. He was foaming from his mouth. And I didn't look at him anymore because I was scared. Is he breathing? He's turning purple. Reporter: The father and son pair had been kite surfing near st. Augustine, florida, when lightning strike hit out of the blue. He had also been hit, stinging from pain, kai sprung into action. Dad, like, wake up and everything. And these people started running to him. Anybody know cpr? Tell them they need to do at least 100 compressions per minute. Reporter: An ambulance arrived just minutes later. But he was in critical condition. THEY'RE PUTTING s IN HIM. Reporter: Those billion volts burned his skin. Second-degree burns. But after a night in the icu, he survived. I'm feeling very thankful. I know, it could have been bad. Reporter: And to celebrate, the duo intends to go right back out to kite surf. For "good morning america," abc news, matt gutman, miami.

This transcript has been automatically generated and may not be 100% accurate.

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